Abstract: A press-forming die (1) includes a die (2) having a die corner (21), which follows along an inward-facing corner (41) of a blank sheet (4), and a punch (3) having a punch corner (31). A corner groove (6) extends along a portion of the punch corner at which leading surfaces (33) and a side surface (34) intersect in a relative stroke direction (X) of the punch. The corner groove is shaped such that its groove width (W) decreases in the stroke direction and converges at a punch corner center (C1). A shoulder radius (Rps) of punch shoulders (3S), which are portions along which the corner groove and the leading surfaces intersect with the side surface, a sheet thickness (t) of the blank sheet (4), and a flange length (Ls) at both ends of the inward-facing corner preferably satisfy the relationship t?Rps?Ls.

Abstract: A variable geometry exhaust turbocharger, wherein bolts which fasten a variable nozzle mechanism do not loosen. A variable geometry exhaust turbocharger, is provided with a turbine housing a turbine rotor, a turbine shaft a bearing for supporting the turbine shaft, a bearing housing, and a variable nozzle mechanism for regulating the flow of exhaust gas. The variable nozzle mechanism is provided with a nozzle, a nozzle mount, a lever plate, and a drive ring. A nozzle plate with which the tip of the nozzle makes contact is provided to an inner tube section of the turbine housing. A sleeve member is provided between the nozzle mount and the nozzle plate so as to be coaxial with a through-hole and a screw-through hole. The nozzle mount and the nozzle plate are connected together by fastening bolts passed through the through-hole, the sleeve member, and the screw through-hole, in that order.

Abstract: A variable-capacity exhaust turbocharger is provided which is equipped with a variable-nozzle mechanism having a lever plate and a peripheral structure capable of ensuring regular operability of a nozzle vane and of preventing an occurrence of local excessive stress by increasing rigidity of the lever plate without increasing a thickness of the lever plate.

Abstract: A variable geometry exhaust turbocharger, wherein bolts which fasten a variable nozzle mechanism do not loosen. A variable geometry exhaust turbocharger is provided with a turbine housing (1), a turbine rotor (3), a turbine shaft (3A), a bearing (5) for supporting the turbine shaft, a bearing housing (4), and a variable nozzle mechanism (8) for regulating the flow of exhaust gas. The variable nozzle mechanism (8) is provided with a nozzle (6), a nozzle mount (7), a lever plate (11), and a drive ring (10). A nozzle plate (9) with which the tip of the nozzle (6) makes contact is provided to an inner tube section (1a) of the turbine housing (1). A sleeve member (12) is provided between the nozzle mount (7) and the nozzle plate (9) so as to be coaxial with a through-hole (7a) and a screw-through hole (9a). The nozzle mount (7) and the nozzle plate (9) are connected together by fastening bolts (B) passed through the through-hole (7a), the sleeve member (12), and the screw through-hole (9a), in that order.

Abstract: A variable-capacity exhaust turbocharger is provided which is equipped with a variable-nozzle mechanism having a lever plate and a peripheral structure capable of ensuring regular operability of a nozzle vane and of preventing an occurrence of local excessive stress by increasing rigidity of the lever plate without increasing a thickness of the lever plate.

Abstract: Provided is a variable-throat exhaust turbocharger in which a nozzle assembly including a nozzle mount and nozzle vanes has a firm support structure without affection by a thermal deformation of a turbine casing and an external force exerted to the turbine casing, and a scroll portion is formed in a substantially opened configuration so that the nozzle assembly can be simply formed in order to reduce the number of mold cores for a scroll during casting of the turbine casing, thereby it is possible to enhance the productivity of the turbine casing.

Abstract: An electromagnetic repulsion drive switching device in which a contact-closing coil and a contact-opening coil are arranged to confront a conductive repulsive member, and in which a drive current is fed to a selected one of the individual coils from a capacitor charged to a predetermined charge voltage by a charging power source. A stationary contact and a movable contact are brought into and out of contact by a repulsion electromagnetic force generated between the coils and the repulsion member. A voltage control controls the output voltage of the charging power source so that the peak value of the drive current may fall within a range with respect to a temperature change of the capacitor. As a result, even if the working temperature of the capacitor changes, the drive current of the contact-closing coil and the contact-opening coil falls within a desired range.